主页 / 问题 / 1113357
Accepted
Andrey Khan
Asked:2020-04-21 15:09:21 +0000 UTC2020-04-21 15:09:21 +0000 UTC

颤振块库

  • 772

使用块的用户授权问题。

 Widget build(BuildContext context) {
    return MaterialApp(
     home: MultiBlocProvider(
    providers: [
      BlocProvider(
        create: (context) => AuthBloc(authServiceTest: authServiceTest)
          ..add(AppStartedEvent()),
      ),
    ],
    child: BlocBuilder<AuthBloc, AuthState>(builder: (context, state) {
        if (state is Authenticated) {
          return app(state.user);
        } else if (state is UnAuthenticated) {
          return HomeScreenTest();
        } else {
          return Container();
        }
      }),
    ),
  ),
);
  }

  Widget app(FirebaseUser user) {
    return Center(
      child: Text('hello'),
    );
  }
}

堵塞

class AuthBloc extends Bloc<AuthEvent, AuthState> {
 AuthServiceTest authServiceTest;
  AuthBloc({@required AuthServiceTest authServiceTest}) {
    this.authServiceTest = authServiceTest;
  }

  @override
  AuthState get initialState => AuthInitial();

  @override
  Stream<AuthState> mapEventToState(AuthEvent event) async* {
    if (event is AppStartedEvent) {
      try {
        var isSignedin = await  authServiceTest.isSignedIn();
        if (isSignedin) {
          var user = await  authServiceTest.currentUser();
          yield Authenticated(user: user);
        } else {
          yield UnAuthenticated();
        }
      } catch (e) {
        yield UnAuthenticated();
      }
    }
  }
}

阻止事件

class AppStartedEvent extends AuthEvent {
  @override
  List<Object> get props => throw UnimplementedError();
}

阻塞状态

class Authenticated extends AuthState {
  final FirebaseUser user;

  Authenticated({@required this.user});
  @override
  List<Object> get props => [];
}

class UnAuthenticated extends AuthState {
  @override
  List<Object> get props => throw UnimplementedError();

所有功能

class AuthServiceTest {

 FirebaseAuth auth = FirebaseAuth.instance;

  Future registerUser(String email, String password) async {
    var authResult = await auth.createUserWithEmailAndPassword(
        email: email, password: password);
    return authResult.user;
  }

  Future signIn(email, password) async {
    var authResult = await auth.signInWithEmailAndPassword(
      email: email,
      password: password,
    );
    return authResult.user;
  }

  Future signOut() async {
    await auth.signOut();
  }

  Future<bool> isSignedIn() async {
    var currentUser = await auth.currentUser();
    return currentUser != null;
  }

  Future currentUser() async {
    var user = await FirebaseAuth.instance.currentUser();
    return user;
  }
}

授权工作，在它应该显示应用程序小部件之后，但它没有。或者逻辑或功能块中的问题，我没有正确注册以获取用户。

flutter

2 个回答

  1. 凭记忆写的，可能需要在某个地方更正。该方法isSignedIn()可以删除。

    Future currentUser() async {
  FirebaseUser user = await auth.currentUser();
  return user;
}

...

@override
Stream<AuthState> mapEventToState(AuthEvent event) async* {
  if (event is AppStartedEvent) {
    authServiceTest.isSignedIn().then((user){
      if (user.uid != null) {
        print("User: ${user.uid}");
        yield Authenticated(user: user);
      } else {
        print("User null");
        yield UnAuthenticated();
      }
    }).catchError((e) {
      print("Error: ${e.error}");
      yield UnAuthenticated();
    });
  }
}

    如果控制台中没有显示任何内容，那么这就是问题所在if (event is AppStartedEvent)。

    • 0
  2. Best Answer

    您的用户如何获得授权？如果通过调用，AuthServiceTest.signIn(email, password)那么您的 BloC 无法跟踪这些更改，您需要向 Bloc 添加两个附加事件：SignIn 和 SignOut，块内将调用相应的方法AuthServiceTest

    它看起来像这样：

    事态发展

    class AppStartedEvent extends AuthEvent {
  @override
  List<Object> get props => [];
}

class SignInEvent extends AuthEvent {
 SignInEvent(this.email, this.password);
 final String email, password;

  @override
  List<Object> get props => [email, password];
}

class SignOutEvent extends AuthEvent {
  @override
  List<Object> get props => [];
}

    阻止自己：

    class AuthBloc extends Bloc<AuthEvent, AuthState> {
  AuthBloc({@required this.authServiceTest})
 final AuthServiceTest authServiceTest;

  @override
  AuthState get initialState => AuthInitial();

  @override
  Stream<AuthState> mapEventToState(AuthEvent event) async* {
    if (event is AppStartedEvent) {
      try {
        var isSignedin = await  authServiceTest.isSignedIn();
        if (isSignedin) {
          var user = await  authServiceTest.currentUser();
          yield Authenticated(user: user);
        } else {
          yield UnAuthenticated();
        }
      } catch (e) {
        yield UnAuthenticated();
      }
    }

    if (event is SignInEvent) {
      try {
        final user = await authServiceTest.signIn(event.email, event.password);
        yield Authenticated(user: user);
      } catch (error) {
        yield UnAuthenticated();
      }
    }

    if (event is SignOutEvent) {
      authServiceTest.signOut();
      yield UnAuthenticated();
    }

  }
}

    之后调用authBloc.add(SignInEvent(email, password))会authBloc.add(SignOutEvent())导致block状态的相应变化和UI的重绘，最终会在授权时显示你的app widget

    • 0

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